Yeah, I'm shocked at this. Before seeing this, my naïve guess for "how strong do you think glasses get" would have been in the range of -15 to -20. I've got a friend in the -8 ballpark and already thought that was surprising.

You can get lenses around -20 even from Zenni optical. They are pretty routine.

And that surprises me too, though I never claimed to be an expert on modern optometrics. I'm sitting here at a comparatively mild -1.5.

Yes, above 5-6 diopters is considered high myopia, since that's where the risks for retinal detachment, glaucoma, etc. already increase significantly due to the elongated eyeball.

With high myopia, the vertex distance [0] starts to play a big role. Basically, as an example, if someone needs -10D glasses, the eye just has around -8.75D of myopia [1] (when wearing contact lenses). This gap becomes larger the higher the diopters are.

Using the formula on [0], I think this person has around -46.5D of myopia, but needs -106D glasses due to the vertex distance.

[0] https://en.wikipedia.org/wiki/Vertex_distance [1] https://en.wikipedia.org/wiki/Vertex_distance#/media/File:Ve...

Apparently "Jan Miskovic has had eye problems since he was a child. Her eye disorder is quite complex, not only suffering from myopia, she also suffers from amblyopia in both eyes, astigmatism, strabismus, and keratoconus. And every year, the ability to see from his eyes is always down 4 to 5 diopters." https://www.kaskus.co.id/show_post/614e138ffdaf1f458260070d/...

Which includes eyeball rugby shaped and bulging cornea.